-Harrison Ford worked as a pizza
delivery man and a carpenter. During that
time he also became a stagehand for the rock band The Doors. He also
built a sun deck for actress Sally Kellerman and a recording studio for
Brazilian band leader Sérgio Mendes. SourceSource

-Sharon Stone worked at McDonald's before she was
famous. So did Shania Twain, Jay Leno, Rachel McAdams and P!nk. SourceWhen P!nk worked at
McDonald's she was fired because she used to eat burgers while she was
working.Source

-Suze Orman was a short-order cook and waitress at the
Buttercup Bakery in Berkeley, California, from 1973 to 1980. Source

-Sylvester Stallone cleaned up lion cages at the Central Park Zoo,
as well as sliced fish heads for a living, before
he was famous. Source

-Warren Beatty was a rodent catcher at the National Theatre in
Washington. Source

-Warren Buffet once worked as a paperboy for The Washington Post and the
Times-Herald.Source

-Whitney Houston sang the jingle used in
commercials for Bounce fabric sheets, early in her career.Source